I have that often. I would scuffle it about a bit today and leave them to move their eggs to a more suitable place. Then check in on Sunday, it might be fine to use then. Apart from anything else, I get covered in unpleased ants if I try to use it while they are in residence. A bit of light disturbance should be enough to move them on.
They nest in there because it's warm and dry. Spread it out if you can so the ants move on and the birds get the eggs then, when you start again, keep the compost wetter.
Vendée - 20kms from Atlantic coast. "We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
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"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw